PACCAR PX-9 CM2350 (2013-17) Fault Code:296 PID:443 SPN:1388 FMI:14 Auxiliary Pressure Sensor Input 2 – Special Instructions

Reason:
Auxiliary Pressure Sensor Input 2 – Special Instructions

Effect:
Possible reduced engine performance.

Circuit Description:
The original equipment manufacturer (OEM) has the option of wiring a pressure or temperature sensor input to the Cummins® engine control module (ECM). A specific calibration is then created to recognize this pressure or temperature sensor input. This fault code is activated when the pressure or temperature input from the OEM sensor exceeds the engine protection limit defined by the OEM. Depending on OEM requirements, an Engine Protection derate can be associated with this fault code.

Component Location:
The OEM pressure sensor input and location will vary. Refer to the OEM service manual for sensor location.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the OEM pressure signal circuit was out of range high.

Action Taken When the Fault Code is Active:
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.
3) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults.

Shop Talk:
This fault code is activated when the pressure input from the OEM sensor exceeds the engine protection limit defined by the OEM. An engine power derate is possible depending on the OEM application.

Possible Causes:
1) Inactive fault codes